Weld Neck flanges ASME B16.5 Class 150 lbs Manufacturer
We are a professional manufacturer and exporter of ANSI / ASME B16.5 Class 150 Weld neck flanges in carbon steel, stainless steel, alloy steel, and duplex grades. Designed to meet the requirements of low-pressure piping systems, Class 150 flanges are widely used in oil & gas, chemical, water treatment
Our Weld neck flanges comply with ASME B16.5 dimensional standards and are supplied with full traceability and material certification according to ASTM and EN standards.
What is ASME B16.5 Class 150 ?
ASME B16.5 is the American standard for pipe flanges and flanged fittings ranging from ½” to 24″ nominal size, covering pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing.
Class 150 refers to the pressure rating of the flange. It is designed for systems operating at up to:
- 285 psi at 100°F (20°C) for most carbon steel flanges
- Higher or lower pressure depending on material and temperature (per ASME B16.5 pressure–temperature tables)
Weld neck flanges (WN )
Also known as Butt weld flanges. Their long necks are butt welded to a pipe. The flange’s bore matches that of the pipe, reducing turbulence and erosion. This flanged connection relocates stress to the pipes, ensuring a decrease in high-stress concentration at the bottom of the flange. When installing, weld neck pipe flanges must be positioned parallel at the time of fitting. Flanges at opposite ends of a pipe should typically have the same bolt-hole direction too.
Technical Specifications – ASME B16.5 Class 150 Flange
| Standard | ANSI / ASME B16.5 |
|---|---|
| Pressure Rating | Class 150 (PN 20 Equivalent) |
| Nominal Size | ½″ (DN 15) to 24″ (DN 600) |
| Material Grades | ASTM A105, A350 LF2, A182 F304/L, F316/L, A182 F51, A182 F11, A182 F22, etc. |
| Flange Types | Weld Neck (WN), |
| Face Types | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
| Drilling | ANSI 150 bolt drilling |
| Standards | ASME B16.5, ASTM A105/A182, EN 10204 3.1 |
DIMENSIONS and Weight OF WELD NECK FLANGES ASME B16.5 CLASS 150 LBS
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| PNB | POD | O | B | tf | Y | A | X | R | N | H | W | KG/PC |
| 15 | 21.3 | 90 | 15.8 | 9.6 | 46 | 21.3 | 30 | 34.9 | 4 | 15.9 | 60.3 | 0.48 |
| 20 | 26.7 | 100 | 20.9 | 11.2 | 51 | 26.7 | 38 | 42.9 | 4 | 15.9 | 69.9 | 0.71 |
| 25 | 33.4 | 110 | 26.6 | 12.7 | 54 | 33.4 | 49 | 50.8 | 4 | 15.9 | 79.4 | 1.01 |
| 32 | 42.4 | 115 | 35.1 | 14.3 | 56 | 42.2 | 59 | 63.5 | 4 | 15.9 | 88.9 | 1.33 |
| 40 | 48.3 | 125 | 40.9 | 15.9 | 60 | 48.3 | 65 | 73.0 | 4 | 15.9 | 98.4 | 1.72 |
| 50 | 60.3 | 150 | 52.5 | 17.5 | 62 | 60.3 | 78 | 92.1 | 4 | 19.1 | 120.7 | 2.58 |
| 65 | 73.0 | 180 | 62.7 | 20.7 | 68 | 73.0 | 90 | 104.8 | 4 | 19.1 | 139.7 | 4.11 |
| 80 | 88.9 | 190 | 77.9 | 22.3 | 68 | 88.9 | 108 | 127.0 | 4 | 19.1 | 152.4 | 4.92 |
| 100 | 114.3 | 230 | 102.3 | 22.3 | 75 | 114.3 | 135 | 157.2 | 8 | 19.1 | 190.5 | 6.84 |
| 125 | 141.3 | 255 | 128.2 | 22.3 | 87 | 141.3 | 164 | 185.7 | 8 | 22.2 | 215.9 | 8.56 |
| 150 | 168.3 | 280 | 154.1 | 23.9 | 87 | 168.3 | 192 | 215.9 | 8 | 22.2 | 241.3 | 10.60 |
| 200 | 219.1 | 345 | 202.7 | 27.0 | 100 | 219.1 | 246 | 269.9 | 8 | 22.2 | 298.5 | 17.60 |
| 250 | 273.0 | 405 | 254.6 | 28.6 | 100 | 273.0 | 305 | 323.8 | 12 | 25.4 | 362.0 | 24.00 |
| 300 | 323.8 | 485 | 304.8 | 30.2 | 113 | 323.8 | 365 | 381.0 | 12 | 25.4 | 431.8 | 36.50 |
| 350 | 355.6 | 535 | 33.4 | 125 | 355.6 | 400 | 412.8 | 12 | 28.6 | 476.3 | 48.40 | |
| 400 | 406.4 | 595 | 35.0 | 125 | 406.4 | 457 | 469.9 | 16 | 28.6 | 539.8 | 60.60 | |
| 450 | 457.2 | 635 | 38.1 | 138 | 457.0 | 505 | 533.4 | 16 | 31.8 | 577.9 | 68.30 | |
| 500 | 508.0 | 700 | 41.3 | 143 | 508.0 | 559 | 584.2 | 20 | 31.8 | 635.0 | 84.50 | |
| 600 | 609.6 | 815 | 46.1 | 151 | 610.0 | 663 | 692.2 | 20 | 35.0 | 749.3 | 115.00 |
Download WELD NECK FLANGES ASME B16.5 CLASS 150 LBS Dimension PDF
Class 150 Weld Neck Flanges Material
Carbon Steel
- ASTM A105 / A105N Weld neck Flanges Class 150 lbs
- ASTM A350 LF2 Weld neck Flanges Class 150 lbs (Low Temperature)
- ASTM A694 F52 / F60 / F65 Weld neck Flanges Class 150 lbs
Stainless Steel
- ASTM A182 F304 / F304L Weld neck Flanges Class 150 lbs
- ASTM A182 F316 / F316L Weld neck Flanges Class 150 lbs
- ASTM A182 F321 / F347 Weld neck Flanges Class 150 lbs
Alloy Steel
- ASTM A182 F11 / F12 / F22 Weld neck Flanges Class 150 lbs
- ASTM A182 F5 / F9 / F91 Weld neck Flanges Class 150 lbs
Duplex & Super Duplex Steel
- ASTM A182 F51 (UNS S31803) Weld neck Flanges Class 150 lbs
- ASTM A182 F53 / F55 (UNS S32760 / S32750) Weld neck Flanges Class 150 lbs
Nickel Alloys & Others
- ASTM B564 N06600, N06625, N08825
- Copper Nickel C70600 / C71500
- Monel®, Hastelloy®, Inconel®, etc.
Weld neck flanges Cl 150 Tests & Certifications
- Ultrasonic & Dye Penetrant (NDT)
- PMI (Positive Material Identification)
- Hardness & Mechanical Tests
- NACE MR0175, PED, and 3.1 MTC
Download the Dimension of ASME B16.5 Weld neck Flange
⬇️ Download Dimension of Weld Neck flanges Class 150 lbs ASME B16.5 PDF
⬇️ Download Dimension of Weld Neck flanges Class 300 lbs ASME B16.5 PDF
⬇️ Download Dimension of Weld Neck flanges Class 400 lbs ASME B16.5 PDF
⬇️ Download Dimension of Weld Neck flanges Class 600 lbs ASME B16.5 PDF
⬇️ Download Dimension of Weld Neck flanges Class 900 lbs ASME B16.5 PDF
⬇️ Download Dimension of Weld Neck flanges Class 1500 lbs ASME B16.5 PDF
⬇️ Download Dimension of Weld Neck flanges Class 2500 lbs ASME B16.5 PDF
